Refer to the following access list.
access-list 100 permit ip any any log
After applying the access list on a Cisco router, the network engineer notices that the router CPU
utilization has risen to 99 percent. What is the reason for this?
A.
A packet that matches access-list with the “log” keyword is Cisco Express Forwarding switched.
B.
A packet that matches access-list with the “log” keyword is fast switched.
C.
A packet that matches access-list with the “log” keyword is process switched.
D.
A large amount of IP traffic is being permitted on the router.
If you enable CEF and then create an access list that uses the log keyword, the packets that match the access list are not CEF switched. They are fast switched. Logging disables CEF.
http://www.cisco.com/c/en/us/td/docs/ios/12_2s/feature/guide/fsaclseq.html
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Answer B indeed.
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Answer C is correct.
If you enable Cisco Express Forwarding and then create an access list that uses the log keyword, the packets that match the access list are not Cisco Express Forwarding switched. They are process switched. Logging disables Cisco Express Forwarding.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipswitch_cef/configuration/xe-3s/isw-cef-xe-3s-book/isw-cef-enable-disable.html
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